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学者姓名：袁涛
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Abstract ：
Thermal history during the additive manufacturing (AM) process significantly influences the performance of the produced structures. In numerous studies, researchers have focused on developing thermal prediction models for enhanced quality control and defect mitigation in AM processes. In this study, we address the challenge of online thermal history prediction in arbitrary observation areas during the AM process. We propose an online prediction method based on infrared monitoring and deep learning technology. Specifically, we consider the impact of the surface morphology of deposited parts on emissivity, and develop a machine learning model to identify and predict emissivity values within the observation area. We use an improved TCN-TrF model for the long-term temporal prediction of thermal history trends, and combine it with a cross-attention mechanism to better capture spatial and temporal features. Numerical and case studies demonstrate that the proposed emissivity identification method and the parallel architecture with a cross-attention mechanism significantly enhance the model's predictive accuracy, achieving excellent performance on unseen data. The results indicate that the proposed method can effectively predict emissivity and accurately capture thermal trends in observation areas, showing great potential for process control and thermal management in AM.
Keyword ：
Additive manufacturing Additive manufacturing Deep learning Deep learning Online prediction Online prediction Thermal history modeling Thermal history modeling
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| GB/T 7714 | Liu, Chenfei , Yuan, Tao , Shan, He et al. A novel deep learning model for the real-time prediction of emissivity and thermal history in metal additive manufacturing processes [J]. | JOURNAL OF MANUFACTURING PROCESSES , 2025 , 135 : 301-314 . |
| MLA | Liu, Chenfei et al. "A novel deep learning model for the real-time prediction of emissivity and thermal history in metal additive manufacturing processes" . | JOURNAL OF MANUFACTURING PROCESSES 135 (2025) : 301-314 . |
| APA | Liu, Chenfei , Yuan, Tao , Shan, He , Wang, Yixiang , Lai, Honglie , Chen, Shujun . A novel deep learning model for the real-time prediction of emissivity and thermal history in metal additive manufacturing processes . | JOURNAL OF MANUFACTURING PROCESSES , 2025 , 135 , 301-314 . |
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Abstract ：
Wire arc additive manufacturing (WAAM) of Al-Zn-Mg-Cu alloys often leads to poor strength and ductility due to microstructure defects, significantly limiting its application. This study employed friction stir processing (FSP) to reduce porosity and break up continuous coarse second phases along the grain boundaries. By adding high-entropy alloy (HEA) particles with good wettability during FSP, Al-Zn-Mg-Cu alloy components with simultaneously improved strength and ductility were produced. The results indicated that the grain structure transformed from columnar to equiaxed and was refined to 2.3 mu m owing to the dynamic recrystallization of FSP and the particle-stimulated nucleation of HEA particles, while the continuous second phase was fragmented into nanoscale precipitates uniformly distributed in the matrix, acting as dislocation movement barriers. The newly formed Ni3Al precipitates second phases ensure good ductility due to its low lattice mismatch with Al matrix. Additionally, the HEA particles maintained strong interfacial bonding with Al matrix, with an interfacial layer thickness of similar to 400 nm. The FSP-HEA treated components showed increased hardness (151.8 HV), ultimate tensile strength (374.3 +/- 20.4 MPa), and elongation (10.6 % +/- 1.6 %) compared to the WAAM as-deposited state. This study provides guidance for the improvement of microstructural defects and the simultaneous enhancement of the strength and ductility of high-strength Al alloy WAAM components.
Keyword ：
Particle reinforcement Particle reinforcement Al-Zn-Mg-Cu alloy Al-Zn-Mg-Cu alloy Friction stir processing Friction stir processing High-entropy alloy High-entropy alloy Wire arc additive manufacturing Wire arc additive manufacturing
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| GB/T 7714 | Shan, He , Li, Yang , Wang, Shuwen et al. Friction stir processing of wire arc additively manufactured Al-Zn-Mg-Cu alloy reinforced with high-entropy alloy particles: Microstructure and mechanical properties [J]. | JOURNAL OF ALLOYS AND COMPOUNDS , 2025 , 1020 . |
| MLA | Shan, He et al. "Friction stir processing of wire arc additively manufactured Al-Zn-Mg-Cu alloy reinforced with high-entropy alloy particles: Microstructure and mechanical properties" . | JOURNAL OF ALLOYS AND COMPOUNDS 1020 (2025) . |
| APA | Shan, He , Li, Yang , Wang, Shuwen , Yuan, Tao , Chen, Shujun . Friction stir processing of wire arc additively manufactured Al-Zn-Mg-Cu alloy reinforced with high-entropy alloy particles: Microstructure and mechanical properties . | JOURNAL OF ALLOYS AND COMPOUNDS , 2025 , 1020 . |
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Abstract ：
The formation of brittle intermetallic compounds (IMCs) poses a challenge to Al/Mg dissimilar alloys FSW. The results of the implemented systematic Cu interlayer experiments show that the diffusion forms of elements in the weld nugget zone (WNZ) and banded structure zone (BSZ) varied at different rotation speeds and Cu interlayer thicknesses. Adding Cu interlayer led to the evolution of conventional aluminium-magnesium IMCs towards aluminium-copper, magnesium-copper, and aluminium-copper-magnesium IMCs. The tensile properties of the joints reached the maximum at lower rotation speeds and thinner interlayer thicknesses, respectively, which was attributable to the generation of Al2Cu and Al2CuMg with the best compressive and shear resistance, respectively. Simultaneously, the dispersion distribution of Cu elements and phase transition weakened the stress gradient of BSZ.
Keyword ：
intermetallic compounds intermetallic compounds banded structure zone banded structure zone Cu interlayer Cu interlayer stress gradient stress gradient Al/Mg dissimilar alloys FSW Al/Mg dissimilar alloys FSW
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| GB/T 7714 | Liu, Yongyong , Wang, Ziqian , Jiang, Xiaoqing et al. Evolution of microstructure and enhanced mechanical properties of dissimilar Al and Mg joints with Cu interlayer fabricated by friction stir welding [J]. | SCIENCE AND TECHNOLOGY OF WELDING AND JOINING , 2024 , 29 (3) : 202-212 . |
| MLA | Liu, Yongyong et al. "Evolution of microstructure and enhanced mechanical properties of dissimilar Al and Mg joints with Cu interlayer fabricated by friction stir welding" . | SCIENCE AND TECHNOLOGY OF WELDING AND JOINING 29 . 3 (2024) : 202-212 . |
| APA | Liu, Yongyong , Wang, Ziqian , Jiang, Xiaoqing , Yuan, Tao . Evolution of microstructure and enhanced mechanical properties of dissimilar Al and Mg joints with Cu interlayer fabricated by friction stir welding . | SCIENCE AND TECHNOLOGY OF WELDING AND JOINING , 2024 , 29 (3) , 202-212 . |
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Abstract ：
The dissimilar AZ31B/AZ61 Mg alloy joints were fabricated by pulse current-assisted friction stir welding (PCaFSW). The maximum tensile strength and elongation were 314.28 MPa and 13.66%, respectively. A micro interlocking structure was formed and the grain refinement effect was enhanced by the PCaFSW process, which was improved relative to that in the conventional FSW. The enhanced strength and plasticity with increasing pulse current were attributable to the grain refinement, weakening of texture strength, formation of nano-scale precipitates and increase of short dislocation lines. The fracture mode was transformed from a brittle fracture mode to a combined fracture mode of brittle and ductile fractures.
Keyword ：
pulse current assisted FSW pulse current assisted FSW AZ31B AZ31B grain refinement grain refinement dislocations dislocations AZ61 Mg alloys AZ61 Mg alloys texture weakening texture weakening
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| GB/T 7714 | Wang, Ziqian , Liu, Yongyong , Yuan, Tao et al. Microstructure and enhanced mechanical performances of dissimilar Mg alloys fabricated by pulse current-assisted friction stir welding (PCaFSW) [J]. | SCIENCE AND TECHNOLOGY OF WELDING AND JOINING , 2023 , 28 (6) : 433-443 . |
| MLA | Wang, Ziqian et al. "Microstructure and enhanced mechanical performances of dissimilar Mg alloys fabricated by pulse current-assisted friction stir welding (PCaFSW)" . | SCIENCE AND TECHNOLOGY OF WELDING AND JOINING 28 . 6 (2023) : 433-443 . |
| APA | Wang, Ziqian , Liu, Yongyong , Yuan, Tao , Wang, Lei , Chen, Shujun , Gao, Qiang . Microstructure and enhanced mechanical performances of dissimilar Mg alloys fabricated by pulse current-assisted friction stir welding (PCaFSW) . | SCIENCE AND TECHNOLOGY OF WELDING AND JOINING , 2023 , 28 (6) , 433-443 . |
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Abstract ：
In this work, laser welding was performed on the hot roll bending parts obtained by local-induction-heating bending forming. The influence of the crystallographic characteristics of the phase transformation products in different regions of the laser welded joint on the mechanical properties was systematically studied, and the reasons for the performance degradation were discussed in detail. The results show that upper-critical HAZ (UCHAZ) forms coarse prior austenite grain (PAG) and bainite, resulting in the lowest dislocation density of 2.5 x 1014 m- 2 and the lowest impact toughness value of 46 J/cm2. Sub-critical HAZ (SCHAZ) forms tempered martensite, causing the joint to soften and the tensile strength to decrease by 18%. The number of variants in SCHAZ is the lowest, where short laths with smaller misorientations merge into long laths, and precipitates nucleation and growth occurs. The uniform orientation of the variants in SCHAZ forms low-angle grain boundaries (LAGBs), which reduces the hindrance to crack propagation, so the mechanical properties of SCHAZ decrease. In addition, the texture analysis found that UCHAZ has the highest (001)//RD orientation volume fraction, indicating that UCHAZ is most prone to rapid expansion of brittle cracks on the {001} cleavage plane, so the toughness of UCHAZ is reduced. SCHAZ has the highest {001}(110) texture volume fraction and the lowest proportion of high-angle grain boundaries (HAGB), indicating that the deformed grain structure with the {001} cleavage planes distributed along the LAGB after welding heat tempering is the main reasons for the delamination of SCHAZ.
Keyword ：
Mechanical properties Mechanical properties Laser welding Laser welding Texture Texture Crystallographic characteristics Crystallographic characteristics Microstructure Microstructure
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| GB/T 7714 | Wang, Shuwen , Chen, Shujun , Yuan, Tao et al. Crystallographic characteristics and mechanical behavior of laser welded joints of hot roll bending parts [J]. | MATERIALS CHARACTERIZATION , 2023 , 207 . |
| MLA | Wang, Shuwen et al. "Crystallographic characteristics and mechanical behavior of laser welded joints of hot roll bending parts" . | MATERIALS CHARACTERIZATION 207 (2023) . |
| APA | Wang, Shuwen , Chen, Shujun , Yuan, Tao , Jiang, Xiaoqing , Zhao, Pengjing , Ding, Wutong . Crystallographic characteristics and mechanical behavior of laser welded joints of hot roll bending parts . | MATERIALS CHARACTERIZATION , 2023 , 207 . |
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Abstract ：
In this study, the formation mechanism of the quaternary quasicrystal phase (59.59Al-8.85Cu-16.85Mg-14.71Zn, at. %) in the Al-Cu-Mg-Zn alloy resistance spot welding nugget was revealed. Transmission electron microscopy shows the quasicrystal phase was located at the inner-dendrite zone of which selected area electron diffraction spot exhibits a typical pattern of an icosahedral quasicrystal (fivefold axes). During the cooling process, Cu-MgZn solute enriched within the remnant liquid at the inter-dendrite zone with short-range-ordered clusters structure. Instead transforming to typical crystalline phases, this undercooled remnant liquid forms the icosahedral quasicrystal phase due to the rapid cooling rate of resistance spot welding. This study shows the feasibility of acquiring massive quasicrystal phase in commercially-used aluminum alloy under common processing condition.
Keyword ：
Quasicrystal Quasicrystal Aluminum alloy Aluminum alloy Resistance spot welding Resistance spot welding Non -equilibrium solidification Non -equilibrium solidification
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| GB/T 7714 | Han, Feng , Han, Hua , Zhang, Yu et al. Formation mechanism of the quasicrystal in Al-Cu-Mg-Zn aluminum alloy resistance spot weld [J]. | MATERIALS LETTERS , 2023 , 350 . |
| MLA | Han, Feng et al. "Formation mechanism of the quasicrystal in Al-Cu-Mg-Zn aluminum alloy resistance spot weld" . | MATERIALS LETTERS 350 (2023) . |
| APA | Han, Feng , Han, Hua , Zhang, Yu , Yuan, Tao , Wang, Caimei . Formation mechanism of the quasicrystal in Al-Cu-Mg-Zn aluminum alloy resistance spot weld . | MATERIALS LETTERS , 2023 , 350 . |
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Abstract ：
High-strength Al-Zn-Mg-Cu aluminum alloys are widely used in large-scale aerospace parts. However, high crack sensitivity limits their development during additive manufacturing. The mechanism of crack formation in Al-Zn-Mg-Cu alloy parts manufactured by wire-arc additive manufacturing was studied through a combination of thermal stress simulations and microstructure analyses. Increasing number of deposition layers gradually expanded the partial melting zone, leading to heat accumulation. In addition, the equivalent stress at both sides was considerably higher than that at the center of the parts, and the equivalent stress at the bottom was the highest, which gradually decreased with increasing distance from the bottom. However, in the initial stage of the deposition, the area of the partial melting zone in the bottom was small; the crack sensitivity was low (no cracks were found). With further deposition, liquation cracks occurred 40-60 mm from the bottom and were initiated at sufficient stress and temperature. The increase in the deposition height increased the stress and crack propagation to form a macro crack.(c) 2021 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
Keyword ：
Microstructure Microstructure Wire-arc additive manufacturing Wire-arc additive manufacturing Liquation crack Liquation crack
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| GB/T 7714 | Chen, Shujun , Xu, Min , Yuan, Tao et al. Thermal-microstructural analysis of the mechanism of liquation cracks in wire-arc additive manufacturing of Al-Zn-Mg-Cu alloy [J]. | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T , 2022 , 16 : 1260-1271 . |
| MLA | Chen, Shujun et al. "Thermal-microstructural analysis of the mechanism of liquation cracks in wire-arc additive manufacturing of Al-Zn-Mg-Cu alloy" . | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T 16 (2022) : 1260-1271 . |
| APA | Chen, Shujun , Xu, Min , Yuan, Tao , Jiang, Xiaoqing , Zhang, Hongda , Zheng, Xing . Thermal-microstructural analysis of the mechanism of liquation cracks in wire-arc additive manufacturing of Al-Zn-Mg-Cu alloy . | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T , 2022 , 16 , 1260-1271 . |
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Abstract ：
ER5356, ER2319, and Zn welding wires were synchronously fed by a GTAW wire + arc additive manufacturing (WAAM) system, and the microstructure and mechanical properties of the deposited Al-Zn-Mg-Cu aluminum alloy components were investigated. The results showed that the phase composition of WAAM 7050 alloy is mainly composed of α-Al, S (Al2CuMg), η (MgZn2), and θ (CuAl2) phases. The composition of each element is in accordance with the intended design and the specifications of the 7050 aluminum alloy composition. The lower portion of each deposited layer is mainly composed of columnar crystals, and the upper portion exhibits an equiaxed crystal structure. A small number of defects, such as pores and microcracks, were observed in the interlayer. The average hardness of the components was 106 HV; the tensile strength is 241 MPa in the horizontal direction and 160 MPa in the vertical direction. The fractographs exhibited typical brittle fracture characteristics. The reasons for the anisotropy of its mechanical properties were explained in detail. © 2020 The Society of Manufacturing Engineers
Keyword ：
Aluminum alloys Aluminum alloys Zinc alloys Zinc alloys Additives Additives Magnesium alloys Magnesium alloys Aluminum coatings Aluminum coatings 3D printers 3D printers Phase composition Phase composition Copper alloys Copper alloys Gas welding Gas welding Wire Wire Tensile strength Tensile strength Textures Textures Microcracks Microcracks Crystal structure Crystal structure Binary alloys Binary alloys
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| GB/T 7714 | Yu, Zhanliang , Yuan, Tao , Xu, Min et al. Microstructure and mechanical properties of Al-Zn-Mg-Cu alloy fabricated by wire + arc additive manufacturing [J]. | Journal of Manufacturing Processes , 2021 , 62 : 430-439 . |
| MLA | Yu, Zhanliang et al. "Microstructure and mechanical properties of Al-Zn-Mg-Cu alloy fabricated by wire + arc additive manufacturing" . | Journal of Manufacturing Processes 62 (2021) : 430-439 . |
| APA | Yu, Zhanliang , Yuan, Tao , Xu, Min , Zhang, Hongda , Jiang, Xiaoqing , Chen, Shujun . Microstructure and mechanical properties of Al-Zn-Mg-Cu alloy fabricated by wire + arc additive manufacturing . | Journal of Manufacturing Processes , 2021 , 62 , 430-439 . |
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Abstract ：
The friction stir overlap welding on variable polarity plasma arc (FSOW-VPPA) weld was first proposed for a complete girth weld in 2219 aluminium alloy. The mechanical properties, microstructures, and metallurgical processes of FSOW-VPPA in comparison to single-FSW and VPPA welded joints were studied in this paper. The FSOW-VPPA welded joint was characterized by the modified nugget zone (NZ), thermo-mechanically affected weld zone (WZ), heat affected fusion zone (FZ), and double heat affected zone (HAZ). The modified NZ was characterized by "onion-rings" without the porosity that appeared in the VPPA weld. The grains in the thermo-mechanically affected WZ were finer than that of the VPPA weld. In the second thermal cycle, the angle of the direction of crystal growth from the horizontal decreased from 38 degrees in the VPPA weld to 22 degrees. In contrast with the single-FSW weld, there was no serious deformation on the advancing side (AS). In general, the second thermal cycle did not degrade the quality of the weld. The elimination of pores and grain refinement improved both the tensile strength and elongation of the FSOW-VPPA weld compared to the VPPA and single-FSW welds. The tensile strength increased to 84.0% compared to 79.8% for the VPPA weld. In addition, the metallurgical processes were analysed and compared. (C) 2019 The Authors. Published by Elsevier B.V.
Keyword ：
VPPA VPPA Overlap weld Overlap weld Metallurgical processes Metallurgical processes FSW FSW Mechanical properties Mechanical properties
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| GB/T 7714 | Yan, Zhaoyang , Chen, Shujun , Li, Xiaoxu et al. Preliminary study of friction stir overlap welding on variable polarity plasma arc weld [J]. | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T , 2020 , 9 (1) : 322-330 . |
| MLA | Yan, Zhaoyang et al. "Preliminary study of friction stir overlap welding on variable polarity plasma arc weld" . | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T 9 . 1 (2020) : 322-330 . |
| APA | Yan, Zhaoyang , Chen, Shujun , Li, Xiaoxu , Yuan, Tao . Preliminary study of friction stir overlap welding on variable polarity plasma arc weld . | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T , 2020 , 9 (1) , 322-330 . |
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Abstract ：
An innovative technology to improve the bonding of refill friction stir spot welding by auxiliary material addition was proposed. The annular groove was eliminated and the energy absorption was increased. Weld bonding was enhanced because the improved technology affected the hook, retractable line and stir zone (SZ) shape significantly: (1) the effective bearing thickness of the welds increased as the hook penetration through the sheet thickness was reduced significantly, (2) the retractable line was eliminated as the dynamic recrystallisation was enhanced along the path of the sleeve moving and (3) fracture propagation was impeded by the bending interface between the SZ and the base materials.
Keyword ：
Refill friction stir spot welding Refill friction stir spot welding retractable line retractable line fracture propagation fracture propagation weld bonding weld bonding hook hook auxiliary material auxiliary material energy absorption energy absorption annular groove annular groove
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| GB/T 7714 | Chen, Shujun , Shi, Jiaxu , Yuan, Tao et al. Improvement of refill friction stir spot welds by auxiliary material addition [J]. | MATERIALS SCIENCE AND TECHNOLOGY , 2019 , 36 (3) : 367-374 . |
| MLA | Chen, Shujun et al. "Improvement of refill friction stir spot welds by auxiliary material addition" . | MATERIALS SCIENCE AND TECHNOLOGY 36 . 3 (2019) : 367-374 . |
| APA | Chen, Shujun , Shi, Jiaxu , Yuan, Tao , Jiang, Xiaoqing . Improvement of refill friction stir spot welds by auxiliary material addition . | MATERIALS SCIENCE AND TECHNOLOGY , 2019 , 36 (3) , 367-374 . |
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